The absorption of carbon dioxide into aqueous ammonia solution using a packed column was investigated. volumetric overall mass transfer coefficients (KGaV) for CO2 solutions were evaluated over ranges main operating variables, that is, up to 15 kPa partial pressure CO2, 61–214 m3/(m2·h) gas flow rate, 0.76–3.06 liquid 2%∼16% fraction, and 20–50 °C temperature. An empirical KGaV correlation this system proposed. Experimental results show the process in is mainly controlled by resistance phase...

Experimental studies on carbon dioxide capture in a spray column were carried out. Fine of aqueous ammonia and NaOH solution used as CO2 absorbent. Effects different operating design parameters, including concentration solution, absorbent volume flow rate total gas removal efficiency investigated. results showed that the higher larger lower mixture nitrogen beneficial to promote efficiency. In order have high CO2, mole ratios absorbents should be than certain values for respectively.

A pilot plant at laboratory scale for absorption of CO2 has been constructed and operated to test the removal by aqueous ammonia solutions. The design is based on a standard desorption flow sheet partial or complete separation gas mixtures. Pilot data efficiencies, effects loading, temperature profiles are obtained. rate-based model, RateFrac in Aspen Plus simulator, used simulate plant. simulation results capture predicted model good agreement with experimental Further, optimization...

Accurate in situ measurement of complex optical surfaces is desired for precision manufacturing, and deflectometry a promising measuring method. However, deflectometry's accuracy depends heavily on the geometric calibration's reliability. Existing calibration methods suffer from limitations low efficiency, complicated operations, expensive equipment. Therefore, self-calibration method proposed monoscopic order to determine camera screen positions. A flat mirror without markers, rather than...

The absorption of carbon dioxide into ammonia aqueous solution using packed reactor and spray column was investigated. removal efficiencies were evaluated over ranges main operating variables, including CO2 inlet concentration, gas flow rate, liquid concentration temperature. Experimental results showed that the suitable reaction temperatures are 40 °C 35 for respectively, mole ratio NH3 to is a key parameter plays an important role on efficiency. Compared with in column, efficiency shows...

This paper presents an advanced phase measuring deflectometry (PMD) method based on a novel mathematical model to obtain three dimensional (3D) shape of discontinuous specular object using bi-telecentric lens.The proposed uses LCD screen, flat beam splitter, camera with lens, and translating stage.The screen is used display sinusoidal fringe patterns can be moved by the stage two different positions along normal direction reference plane.The captures deformed reflected measured surface.The...

Ultraviolet (UV) laser-induced damage to fused silica optics has significantly limited development of high-energy laser systems.The fundamental reason is that the processing defects introduced by current contact grinding and polishing processes are difficult remove completely, which greatly reduces resistance optics.In this study, we demonstrate manufacturing with a high threshold using CO2 process chain (including ablation, cleaning, melt polishing).Based on theoretical experimental...

Extra detections of feature points conducted by a third-party instrument are indispensable in the monoscopic deflectometry to specify surface position, but measuring capability can be limited because most freeform surfaces do not contain any distinguishable and detectable points. In this Letter, behaviors position error form measured discriminated reverse ray-tracing. A novel iterative optimization strategy is developed workpiece for situ deflectometric measurement so that extra avoided. It...

In the phase measuring deflectometry, two groups of fringe patterns in orthogonal directions are usually applied to establish correspondences between pixel pairs on screen and camera. Usually, 16 phase-shifting with different spatial frequencies required order calculate absolute phases conventional temporal unwrapping algorithms. This requirement makes measurement inefficient not robust against environmental noise. this paper, an efficient retrieval strategy is developed, which requires only...

Off-axis deflectometry is widely applied in the measurement of specular surfaces. However, measuring accuracy depends on reliability geometrical calibration. Existing methods are inconvenient to be utilized due their disadvantages low efficiency and operational complexity. A simple calibration method proposed by applying a flat mirror with markers, only one image needs captured. compensation process introduced correct form error mirror. Experimental results show that re-projection errors...

Phase measuring deflectometry is a powerful method for complex optical surfaces, which captures the reflected fringe images encoded on screen under premise of focusing measured specular surface. Due to limited depth field camera, captured and surface cannot be focused at same time. To solve position-angle uncertainty issue, in this Letter, wavefront coding technology used modulate imaging deflectometry, thereby making system insensitive defocus other low-order aberration including...

This paper proposes a novel method for calibrating the relative orientation of camera fixed on rotation axis using constrained global optimization algorithm. Because cannot directly 'see' axis, calibration procedure uses two checkerboards and another with large viewing-angle. One small checkerboard is rotated to determine axis; other calibrates cameras. The determined obtained optical calibrated can be represented in same coordinate system, so that we calculate their orientation. In our...

The phase measuring deflectometry is a powerful method for complex optical surfaces, which captures the reflected fringe images associated with displaying screen and calculates normal vectors of surface under test (SUT) accordingly. captured are usually set conjugate to SUT, in turn makes defocused. As result, blurring effect caused by point spread function (PSF) off-axis catadioptric imaging system can bias solved phases. In order correct errors, light field constructed based on Fourier...

Augmented reality system can be applied to provide precise guidance for various kinds of manual works. The adaptability and guiding accuracy such systems are decided by the computational model corresponding calibration method. In this paper, a novel type augmented designing scheme proposed. Guided external positioning equipment, proposed achieve high relative indication in large working space. Meanwhile, is realized with digital projector general back projection derived geometry relationship...

Sub-aperture polishing is a key technique for fabricating ultra-precision optics. However, the existence of errors that are difficult to be compensated by physical modeling seriously affects manufacturing accuracy and efficiency optical components. To address this problem, data-based systematic error extraction compensation (DSEC) method was proposed enhance on maximize quality in small dataset condition, wavelet transform introduced into process, uncertainty piston term interferometer...

This paper presents a new Phase Measuring Deflectometry (PMD) method to measure specular object having discontinuous surfaces. A mathematical model is established directly relate absolute phase and depth, instead of gradient. Based on the model, hardware measuring system has been set up, which consists beam splitter change optical path, two LCD screens display same sinusoidal fringe patterns. By using model-based machine vision method, calibration accomplished provide required parameters...

Phase measuring deflectometry is a powerful method of complex optical surfaces that captures the reflected fringe images associated with displaying screen and calculates normal vectors surface under test (SUT) accordingly. The captured are usually set conjugate to SUT, which in turn makes defocused. As result, blurring effect caused by defocus aberrations off-axis catadioptric imaging system can severely degrade phases solved from blurred images. In order correct phase errors, space-variant...